Explosion-engine.



H. E. COFFIN.

EXPLOSION ENGINE.

A'PPLIOATIQN FILED MAE. 1, `1909.y

Patented May 16, 1911.

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Wnesseg UMTED s'rArEs PATENT onFIoE.

I HOWARD E. COFFIN, OF DETROIT, MICHIGAN, ASSIGNOR TO CHALMRSl-DETOIT MOTOR OG MPANY, OF DETROIT, MICHIGAN A CORPORATION 0F MICHIGAN.

f EXPLOSION-ENGINE.

Specification of Letters Patent.

Application ma March Y1, 190e. serial No. 480,777.

To all whom it, ,gg/ concem:

`Be it known.."` at I, HOWARD E. CorrIN, a

citizen of the United States of America, residing at Detroit, in the county of AVVay-,ne

and State of Michigan, have invented certhe combustion of the explosive gases.

Tothis end the invention consists in a construction in which theigniter is shielded and cut off from the hotgases in the cylinder during the greater portion of the power stroke; lfurther, inthe peculiar con struction of thev hield or'y cutoff; and, fur-A ther, in the combination of this shield and a valve for controlling the ports of t-he engine, as hereinafter set forth'.

In the drawings-Figure 1 is a longitudi nal section -through an explosion engine Ashowing the ports in the position of ex- Y plosion; Fig. 2 is a similar view showing the shield in position for cutting oi the igniter from the cylinder.

A is the engine cylinder, B the piston, and C the igniter, which is arranged in a recess D in the cylinder, preferably at one side thereof. Communication between this mediate the piston and the cylinder.

- it will quickly cut o communication between the recess D and the cylinder in the early part of the power stroke of the piston.`

The sleeve E is operated by any suitable Vthe crank ease to the cylinder.

means, but, `as shown, is connectedl by a rod G with an e'ccentric \H arranged. directly upon the crank shaft I of the engine, this arrangement '.be'ng adapted for uan engine i of the two-cycli); type. In addition to" its 50 function of shielding the recess D, the sleeve E constitutes a' valve for controlling the various ports ofthe engine. Thus'the exhaust passage is formed by a port J iii, the

sleeve, which registers with-the port K inl I the .cylinder at the proper point in the power stroke. There is also a port L in the sleeve coperating with a. port M in the cylinder to admit the explosive mixture lintothe crank case chamber before its prelimSIL 60 1nary`"compression, and another port N. in t, the sleeve is arranged to coperate with the port O in the cylinder to control the transerof the initially compressed charge from" '65 With my construction, the igniter .is ef-y fectuallyprotected from the heat developed by the combustion of the gases in the cyl inder, and at the same' time is always .in full communication vwith the explosive charge during the' period' of ignition.A

What I claim as my invention is: In an explosion engine, the. combination with 'a piston, of a cylinder form'in the explosion chamber, said cylinder being' pro- 75"' vided with a port and having a recess in one side thereof above the highest point of travel of the piston, an electric 4igniter positioned within 4said recess, and' a cylindrical sleeve 'between said piston and cylinder forming 80 a valve for controlling saidport and being provided with an extension serving as a shield for covering said recess subsequent to said explosion.

In testimony whereof I aix' my signaturev 85 in presence of two witnesses.

l HOWARD E. CQFFIN.\ l

Witnesses:

` LENA M. vCanne,

CHAs. D. LEHMKUBL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner ofv Patents,

, Washington, D, C. 

